<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>demo1</title>
    <style>
        .a{
            color: #c7266c;
        }
    </style>
</head>
<body>
<div id="watch-example">
    <p>
        Ask a yes/no question:
        <input v-model="question">
    </p>
    <p>{{ answer }}</p>
</div>
<script src="vue.js"></script>
<!-- Since there is already a rich ecosystem of ajax libraries    -->
<!-- and collections of general-purpose utility methods, Vue core -->
<!-- is able to remain small by not reinventing them. This also   -->
<!-- gives you the freedom to use what you're familiar with. -->
<script src="https://cdn.jsdelivr.net/npm/axios@0.12.0/dist/axios.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/lodash@4.13.1/lodash.min.js"></script>
<script>
    var watchExampleVM = new Vue({
        el: '#watch-example',
        data: {
            question: '',
            answer: 'I cannot give you an answer until you ask a question!'
        },
        watch: {
            question: function (newQuestion) {
                this.answer = 'Waiting for you to stop typing...'
                this.getAnswer()
            }
        },
        methods: {
            getAnswer: _.debounce(
                function () {
                    if (this.question.indexOf('?') === -1) {
                        this.answer = 'Questions usually contain a question mark. ;-)';
                        return
                    }
                    this.answer = 'Thinking...';
                    var vm = this;
                    axios.get('https://yesno.wtf/api')
                        .then(function (response) {
                            vm.answer = _.capitalize(response.data.answer)
                        })
                        .catch(function (error) {
                            vm.answer = 'Error! Could not reach the API. ' + error
                        })
                },
                // This is the number of milliseconds we wait for the
                // user to stop typing.
                500
            )
        }
    })
</script>
</body>
</html>